You really don't have any say over what she is doing.
Work on yourself.
You cannot predict the future, neither can anyone else. She might die from this, I wouldn't hold on waiting for her to change and "see the light". Even if she were to complete rehab, she would not be a good candidate for a serious relationship for at least a year. Let her go. You are young and there are many suitable women who would love to build a relationship with a young guy with ex-military training and the education to work.
So, get a job, stop worrying about an alcoholic. You broke up with her - so common courtesy is to let her keep the ring. Get the cops to go over to retrieve the rest of your personal belongings.
I made a couple jumps (sport jumps) with The Golden Knights back in the day. Are you going to keep jumping? I loved it.